Calculating-machine.



B. JAHNZ.

CALCULATING MACHINE.

APPLICATION FILED JUI/JE 2a, 1913.

Patented Dec. 16, 1913.

2 SHEETSSHEET 1.

J? 06772 far E. JAHNZ.

CALCULATING MACHINE.

APPLICATION FILED JUNE 28, 1913.

1,081,310, Patented Dc.16,1913.

2 SHEETS SHEET 2.

ERWI N J'AHNZ, OF ZURICH, SWITZERLAND.

CALCULATING-IVEACHINE.

aosnsio.

Specification 0t Letters Patent.

Patented Dec. 16, 1913.

Application filed June 28, 1513. Serial No. 776,402.

prove the construction of the well-known Thomas calculating machine thatthe slide thereof need not be turned up when it is longitudinallydisplaced.

The invention consists in the construction, arrangement and combinationof parts described hereinafter and pointed out in the claims.

Several illustrative embodiments of my invention are represented by wayof example in the wherein Figure 1 is a section through a. machine ofthe Thomas type, but fitted with my new device for releasing the slide,Fig. 2 is a similar section showing the mechanism for driving thenumeral-disks, Figs. 3 and 4 are plan views of portions of the mechanismassociated with the tappets which rotate accompanying drawings,

with the numeral-disks, and Fig. 5 shows the zero-adjusting-rack withtheinterlocking gear actuated thereby.

Referring to the drawings, as is well known in the ordinary Thomascalculating machine with twin-bevel-gears,' the slide must be turned upeach time when :(a) the numeral disk 2 is adjusted to a number, or (b)the numeral disk 2 is adjusted to zero, or (c) the slide 11. is desiredto be displaced longitudinally. This is because in each case thebevel-gears b for the numeral-disks 2 must be lifted from the twinbevel-gears a, i of the driving mechanism, either inorder that thesegears 79 -may. be able to rotate freely, or in order to allow the slideto be longitudinally displaced. This lifting of the guide is howeververy inconvenient, and if. the slide is removable there is, in addition,a danger of its jumping up spontaneously when the crank is quicklyrotated and of errors in calculation arising on this account. Moreover,in this system of guiding the slide, the latter could be supported onlyat a few points, whereby it was easily deflected and so impaired theoperation of the machine. All these defects are obviated if thebevel-wheels of the reversing gear can be thrown out of gear, for thenthe slide need not be lifted at all, and consequently can be so securelyguided that it can neither spring up nor be deflected. Now, as isalready known, the bevel-gears Zz, a and 2' can be thrown out of gear byarranging that the twin bevel-gears a, i 'can be axially displaced intoa middle position, wherein neither the gear a nor the gear '5 mesheswith the gear 6.

According to the present invention the twin bevel-gears a, i aredisplaced by giving a special movementto the crank when in its zero ornormal position. Referring to Fig. 1, the twin bevel-gears a, 'i can beaxially displaced in known manner by means of a bar 9 which passesbetween them and is arranged longitudinally of the machine. According tomy invention, I pivotally connect to this bar q a lever it having two V-shaped recesses d, e. The recess (2 is adapt ed to beengaged by a pin pmounted on the lever Z. The recess e is adapted to be engaged by thestationary 'pin 9. The lever Z is fulcrumed at 0 on the framework of themachine. This latter lever determines according to its or position thatposition of the twin bevel-gears which is required for addition orsubtraction.

The axle 7: of the crank-handle 7c is axially displaceable, and itslower end rests on one end of the lever 72.. A spring f tends to forcethe lever 2. and the crankaxle upwardly. The axle 7" and the lever 7bare depressed before the handle is rotated, and the lever it remains inits depressed position (as shown in Fig. 1) for the entire period duringwhich the handle is rotated. When however the handle is released afterbeing rotated, the spring f raises both the lever 72 and the axle 1:".Consequently the V-shaped recess d is removed from the pin 79', and therightslanting face of the other V-shaped recess e simultaneously bearsagainst the stationary pin 9, and by sliding on the latter draws thelever 71,, the bar q and the twin bevel-gears a, 2' to the right, untilthe vertex of the recess e bears against the pin 9. This brings the twinbevel-gears a, 71 into their middle position, wherein neither of thetwin gears a, i meshes with the gear I). Had however the lever Z and thetwin beveLgears a, 2' been in the position, they would have been alsodisplaced to their middle positions, but in this case by means of theleft slanting face of the recess 6. In this middle position of the twinbevel-gears (a) the numeral-disks 2 can be freely adjusted to a number,or (b) the numeral-disks 2 can be adjusted to zero, or (c) the slide acan be longitudinally displaced without needing to be lifted.

It is preferable to arrange on the crankhandle it" an interlockingdevice which not only prevents the handle from being rotated before itis depressed, but also prevents the spring f from pressing up the leverit and the handle before the latter has arrived at its normal position.Such devices are however already known and need not be furtherdescribed.

Referring to Fig. 2, in Thomass calculating machine, the numeral-disks 2are driven by the graduated cylinder to by means of ten displace-ablenumeral wheels, as r, and the bevehgears i, a, b. The tens aretransferred by means of transferring tappets t which rotate with theaxles of the graduated cylinders but can be axially displaced intopositions below the numeral wheels In by means of the preparing tappets(Z (Figs. 2 and 3) for the numeral-disks owing to the latter tappetsactuating the levers and the slanting two-armed levers 71., whereby,when the transferring tappets t rotate, they drive the wheels is, thebevel-gears a, Z) and finally the numeral-disk z. The levers p aremounted on a carrier Z, which in the heretofore known constructions ofThomass calculating machine has been fast on the middle wall m of thestationary framework of the machine, while the preparing tappets (Zwhich coact with these levers 79 are mounted (at the numeral-disks 2) onthe displace able slide 11. Owing to this arrangement the slide n had tobe lifted each time before being longitudinally displaced in order thatthe tip of the tappet d might pass the point on the lever 79 which wasturned toward it. According to my invention, however, the guide a neednot be lifted when it is displaced longitudinally. To this end, Iarrange that the carrier Z carrying the levers p is fast not on themachine framework on, but on the slide n. Consequently when the slide nis longitudinally displaced, the levers p travel with the tappets d, andthe tips of the latter of course no longer need to be raised over thepoints on the levers 79. On the other hand, the rear sides of the levers7) now slide past the ends of the levers h, and can do this withoutencountering obstruction because the ends of these levers are in astraight line parallel to the direction of motion of the guide.Moreover, the bevel-gears a, I) must of course be thrown out of gear,for example by adjusting the gears a into a middle position.

The mounting of the levers p on the slide n has the additional advantagethat when the numerabdisks z are in their Zero position, the levers 7)can be used as stops to prevent these disks 2 from overrunning theirZero positions. \Vhen for example the zero position is obtained in knownmanner by a rack 0 (Fig. 5), which meshes with the pinions r of thenumeral-disks 2, it is possible that if the said rack 0 be quickly movedthe numeral-disks 2 may be jerked beyond their zero positions. In orderto prevent this, when the rack begins to move the levers 7) are lockedin thea'r normal positions owing to the longitudinal displacement of thelocking bar u, and, while the numeral-disks are being brought to theirzero positions, thus constitute stops which the tappcts (Z cannot pass.In the levers 7) are riveted pins .5' which extend downwardly throughholes 0 in the carrier Z (Figs. 2, 3 and 5). The locking bar a locks thelovers 2) owing to the slanting face on it bearing against the pins 8 ofthe lovers 7). The locking bar a is displaced by the zero-adjusting rack0 owing to the slanting face a; on the latter driving the lever n (Fig.5). disks have been adjusted to their zero positions, the rack 0 isbrought back to its normal position by the spring f, and simultaneouslypresses the locking bar it back into its initial position by means ofthe lever w. The holes (2 in the carrier Z (Fig. 3) form stops for thepins 5 and so Pr vent the levers 7) from swinging out inln the spacesbetween two levers it while the slide a is being displaced, and soobstructing furthcr-n'iovement of the slide a. It is obvious that thelevers p can be replaced by other members, a. g. by pins 9 (Fig. 4:)movably mounted in the framework of the slide, without in any waydeparting from the scope of the invention.

I claim 1. In a Thomas calculating machine comprising a frame, a slidemovable longitudinally therein, a plurality of numeral disks iournaledin the slide, a plurality of pairs of After the numeraldifferentialbevel-gears axially displaceable in the frame, each pair ofbcvelgears-being normally disengaged from, but adapted in its endposition to drive, one of side disks, a bar for axially shifting thepairs of bevelgears; the combination of a crank-shaft journaled in theframe and axially displaceable therein, and an intermediate memberoperated by the displacement of the crankshaft and operating said bar tobring the bevel-gears from their middle position into their plus orminus position.

2. In a Thomas calculating machine comprising a frame, a slide movablelongitudinally therein, a plurality of numeral disks journaled in theslide, a plurality of pairs of differential bevelgears axiallydisplaceable in the frame, each pair of bevel-gears being normallydisengaged from, but adapted in its end position to drive, one of sidedisks, a bar for axially shifting the pairs of bevel gears; thecombination of a crankshaft journaled in the frame and axiallydisplaceable therein, a fixed and a movable stop mounted on the frame,and a spring-controlled intermediate member operatively connected tosaid bar, adapted to be displaced by said crank-shaft and having twoV-shaped recesses, the fixed stop being normally in a vertex of onerecess and the movi able stop being normally at one side or th other ofthe entrance of the other recess.

3. In a Thomas calculating machine comprising a frame, a slide movablelon itudinally therein, a plurality of numera disks and appertainingtens-cams, the combination of a plurality of tens-tappets adapted to bedriven by means of said tens-cams and arranged'on the said movableslide.

In testimony whereof, I aflix my signature 20 in the presence of twowitnesses.

ERWIN JAHNZ.

Witnesses CARL Conner; AUGUST RUEGe.

